UCC28950: duty cycle problem with OUTC and OUTD with increasing the load

Feng bin Su

Expert 8230 points

Part Number: UCC28950
Other Parts Discussed in Thread: UCC28951

Hi team,

My customer has used UCC28950 with duty cycle problem as below waveform.

The duty cycle will be small at OUTC and OUTD which is shown in the below figure.

Is it a normal situation or what kind of reason can induce this behavior? Thanks.

over 5 years ago

0 Colin Gillmor over 5 years ago

TI__Mastermind 25570 points

Hello Feng

The first thing I'd suggest is that the customer use the UCC28951 device instead of the UCC28950. The UCC28951 is a 100% compatible, drop in replacement for the UCC28950 but it works better at wide duty cycles.

Please try this and let me know how you get on.

Regards

Colin

0 Peter Meaney over 5 years ago in reply to Colin Gillmor

TI__Mastermind 31580 points

Hi Feng,

Any update from your testing with the UCC28951?

Regards

Peter

0 Peter Meaney over 5 years ago in reply to Peter Meaney

TI__Mastermind 31580 points

Hi Feng,

Since there has been no reply to this post I am going to close it.

Please open a new post if you have more questions.

Regards

Peter

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UCC28950: duty cycle problem with OUTC and OUTD with increasing the load